Linux Basics

Unused Linux Basics

Shellscript File Tests

if [ -e $file ]; then
./myUtil $file
fi

TEST	MEANING
[ -b $file ]	True if file exists and is block special.
[ -c $file ]	True if file exists and is character special.
[ -d $file ]	True if file exists and is a directory.
[ -e $file ]	True if file exists.
[ -f $file ]	True if file exists and is a regular file.
[ -g $file ]	True if file exists and is set-group-id.
[ -k $file ]	True if file has its ``sticky'' bit set.
[ -L $file ]	True if file exists and is a symbolic link.
[ -p $file ]	True if file exists and is a named pipe.
[ -r $file ]	True if file exists and is readable.
[ -s $file ]	True if file exists and has a size greater than zero.
[ -S $file ]	True if file exists and is a socket.
[ -t $fd ]	True if fd is opened on a terminal.
[ -u $file ]	True if file exists and its set-user-id bit is set.
[ -w $file ]	True if file exists and is writable.
[ -x $file ]	True if file exists and is executable.
[ -O $file ]	True if file exists and is owned by the effective user id.
[ -G $file ]	True if file exists and is owned by the effective group id.

Directory Size Lister/Sorter

du -sm $(find $1 -type d -maxdepth 1 -xdev) | sort -g

 style="font-weight: bold;">Finding Who Has a File Open

[slitt@mydesk slitt]$ /sbin/fuser -mu /d
/d:                   1693(slitt)  1891c(slitt)  1894  1894c(slitt)
1907  1907c(slitt)  1908  1908c(slitt)  1909  1909c(slitt)
1910  1910c(slitt)  1912  1912c(slitt)  1913  1913c(slitt)
[slitt@mydesk slitt]$